Strainer



(No Model.) 2 Sheets-Sheet I.

D. B. GO'IHMV.v

STRAINER.

No. 511,770. Patented Jan. v2, 1894.

(No Model.) 2 sheets-sheet 2.

' D. B. GOTHAM.

STRAINBR.

ilnrrnn Srarns "Farnsr @erica DARVIN B. GO'lI'IAM, OF VATERTOVN, NEV YORK.

STRAINER.

SPECIFICATION forming part of Letters Patent No. 511,770, dated January 2, 1894.

Application filed November 19, 1891. Serial No.4l21388. (No model.)

-'o all whom, it may concern:

. Beit known that I, DARWIN B. GOTHAM, of lVatertowmin the county of Jefferson, in the State of New York, have invented new and useful Improvements in Strainers, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to improvements in strainers particularly adapted for use in the manufacture of pulp and like materials used in making paper and similar materials, and it has for its object the production of a device which is extremely practical, durable and effective.

To this end the invention consists, essentially, in a chamber for receiving the pulp mixed with a desirable amount of liquid and provided with a perforated plate through which pulp of the desired neness readily passes, separate receiving chambers beneath the former chamber for the reception of the' strained pulp and liquid passed through the perforated plate of the upper receiving chamber and provided with movable diaphragms at their base and with suitably depressed outlet passages at their adjacent edges, plun gers movable beneath the diaphragms for drawing the pulp through the perforated base of the upper receiving chamber, and forcing from the perforations the pulp whichnis sufficiently coarse to clog the perforations of the plate, and actuators for operating` said plungers with a variable movement.

The invention furthermore consists in the detail construction and arrangement of the parts, all as hereinafter more particularly described and pointed out in the claims.

In1 describing this invention, reference is had to the accompanying drawings, forming a part of this specification, in which like letters indicate corresponding parts in all the views.

Figure l is a top plan view of my invention, a portion of the perforated plates of the upper chamber being removed and a portion of the wall of said cham berbeingsectioned for the purpose of further illustrating the detail construction of the strainer. Fig. 2 is alongitudinal vertical sectional View, taken on line 2 2, Fig. l. Fig. 3 is a cross sectional view, taken on line 3 3, Fig. 11 Fig. 4is adetail sectional View, taken on line i*i, Fig. l; and Fig. 5 is Yan enlarged elevation of the cam for operating the reciprocating plunger.

In straining pulp and similar materials, suitable perforated or strainer plates are employed for effecting the separation of the fine from the coarse pulp unsuitable for use and in order to effect this separation and prevent clogging of the perforated strainer plates, it is customary to use a vibratory diaphragm and a reciprocating plunger for producing a forcible current through the perforations of the plate.

By practical operation and use of strainers as at present devised, I have observed that the greatest possible efficiency is not derived therefrom for the reason that the plunger moves up and down with the same velocity and does not eject the coarser materials from the perforations of the strainer plates of the chamber with an greater force than it draws the finer grains of the pulp through said perforations to the outlet passage of the machine. In my'invention, the reciprocating plunger is given a variable movement by a suitable actuator so that its downward movement is much slower than its upward movement, thus augmenting the capacity of the machine by increasing the length of time during which the iine pulp and liquid pass through the perforated plates to the outlet conduit of the machine and adding to the efficiency of the machine by more forcibly ejecting the coarse particles of pulp from the strainer plate.

- The frame -A- and its standards -B- are of desirable form, size and construction, the standards being preferably tied together vby bars -b-b-. The upper portion -A- of the frame is hinged at -aat its rear extremity and is secured in position by hinged bolts -afor permitting said upper chamber to be swung backward when the machine is cleaned, repaired, dre. The pulp mixed with a desirable amount of liquid is discharged by suitable conduits -O- into the receiving chamber -D- provided at its base with the perforated plate --D which consists, preferably, of a series of sections -cZ- having their adjacent extremities supported on cross bars -cZ-. Beneath the chamber -D- are the receiving chambers -E-into which pass the ner particles of pulp and the liquid discharged into the chamberA --D-. These .chambers E are separated by suitable partitions -ealternating .with the cross bars -dand adapted to bear against a corresponding partition -e, itbeiiig understood that a suitable packing-e2- is preferably placed betweenthe partitions for preventing the passage from one chamber to the other.

-F- represents the yielding diaphragm at the base of the chambers -E- havingits edges adapted to be secured to the bars a2-a2 of the frame -A- and consisting, preferably, of a piece of rubber belting or similar material capable of continued use and .great flexibility.

At the adjacent edges of the chambers -E- vand between the adjacent edges of the diaphragms -F- are the depressed outlet passages-G- through which the separated pulp passes toa main outlet conduit II- best seen at Figs. 1 and 4.

Beneath the diaphragms -F are plungers -I- consisting of a wooden plate -iadapted to force the diaphragm upwardly and permit the same to move downwardly by the force of the spring -L- presently described the gravity of the superimposed pulp and Water and pressure of the air thereupon, and the metallic plate-1" -for su pportin gthe wooden suitable bearings --J- and -J, the lower one, and if desired, the upper one being provided With a removable bushing At the lower extremity of the plunger rod beneath the bearing -J-, is the lower head IL-havin g a removable wearin g plate 1'2- of bronze or other suitable material adapted to rest upon the periphery of an actuator' or cam K--. This cam is rigidly secured 'to a shaft kjournaled in the standards -B- and is so shaped that the length of the face 7c of its extension K is less than that of the other or return face k2; and, as its length is less circumferentially, its pitch must be steeper and hence its throw greater and quicker. Therefore, this cam will cause the plunger to rise quickly but to descend slowly.

As preferably constructed, thecam is provided with oppositely arranged extensions -K- whereby one revolution thereof reciprocates the plunger twice. As previously stated, this construction of actuator or cam is an important feature of my invention, since it greatly adds to the desirability of the niachine by augmenting its capacity in lengthening the time during which the pulp passes through the strainerplate, and increasing its efficiency in increasing the force with which the plunger ejects the coarser pulp from the perforations of the strainer plate. The spring -L previously mentioned as aiding in the depression of the plunger by forcing the head I2 upon the plunger rod, firmly against the cam K=-, encircles' the upper end of the plunger rod and is interposed between the Projecting from the plunger -I- is its rod -I- which is guided through through which the strained pulp is conducted to any desired locality.

Movable in the upper extremity of the pipe -I-I- is I'a sleeve H2- for regulating the height of the material within, the outlet conduit and in `order to adjust this sleeve, the saine is provided with the upwardly extending rod H3-'passed through a suitable suppo'rt -I-I4- and provided with an adjusting nut -H5-.

The operation of my invention will be-readily perceived from the foregoing .description and upon reference to the drawings, and it will be particularly noted that thesame is extremely durable, eective and practical. It is evident, however, that the detail construction and arrangement of its parts may be somewhat varied from vthose shown'and described. Hence I do not limit my strainer to the precise form and constructionof its parts. v

In my pending application, filed December 8, 1893, (Serial No. 493,103) I show and de scribe a pulp strainer of similar construction to the one herein illustrated and described;

and in said application are included claims on the reciprocating plungers, plunger rods having their lower endsprovided Withremovable wearin gpieces bearing on actuating cams, and coiled springs surrounding the rods and bearing against movable shoulders thereon-N; which subject matter is not claimed herein.

Having thus fully described my invention, what I claim as new,-and desire to secure by Letters Patent, is p L 1. In a strainer, the combination y with a chamber-containing a vhorizontal yperforated plate, vertically movable.plungersjbeneath said plate, and outlet passages in said'receiving chamber leading to a "common delivery; of an outlet conduit having a discharge pipe at its lower end, a sleeve vertically movable within the upper end of said pipe, a threaded rod rising from said sleeve, ya support on the conduit through which said rod passes, and an adjusting nut on the rod above the support, as and for the purpose set forth.

2. In a strainer, the combination with a chamber containing a horizontal perforated plate, vertically movable plungers beneath said plate, a pair of receiving chambers beneath the plate, a partition between such chambers, and outlet passages in 'said receiving chambers at their adjacent edges leading to a common delivery; of an outlet conduit having a discharge pipe at its lower end, and a sleeve vertically movable Within the upper IIO end of said pipe, as and for the purpose set forth.

3. In a strainer, the combination with a chamber containing a horizontal perforated plate, vertically movable plungers beneath said plate, a pair of receiving chambers beneath the plate, a partition between such chambers, and outlet passages in said receiving chambers at their adjacent edges leading to a common delivery; of an outlet conduit having a discharge pipe at its Alower end, a sleeve vertically movable within the upper end of said pipe, a threaded rod rising from 

